arch/arm64/include/asm/dma-mapping.h

   1 /*
   2  * Copyright (C) 2012 ARM Ltd.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16 #ifndef __ASM_DMA_MAPPING_H
  17 #define __ASM_DMA_MAPPING_H
  18
  19 #ifdef __KERNEL__
  20
  21 #include <linux/types.h>
  22 #include <linux/vmalloc.h>
  23
  24 #include <asm-generic/dma-coherent.h>
  25
  26 #include <xen/xen.h>
  27 #include <asm/xen/hypervisor.h>
  28
  29 #define DMA_ERROR_CODE  (~(dma_addr_t)0)
  30 extern struct dma_map_ops *dma_ops;
  31
  32 static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
  33 {
  34         if (unlikely(!dev) || !dev->archdata.dma_ops)
  35                 return dma_ops;
  36         else
  37                 return dev->archdata.dma_ops;
  38 }
  39
  40 static inline struct dma_map_ops *get_dma_ops(struct device *dev)
  41 {
  42         if (xen_initial_domain())
  43                 return xen_dma_ops;
  44         else
  45                 return __generic_dma_ops(dev);
  46 }
  47
  48 #include <asm-generic/dma-mapping-common.h>
  49
  50 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
  51 {
  52         return (dma_addr_t)paddr;
  53 }
  54
  55 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
  56 {
  57         return (phys_addr_t)dev_addr;
  58 }
  59
  60 static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
  61 {
  62         struct dma_map_ops *ops = get_dma_ops(dev);
  63         debug_dma_mapping_error(dev, dev_addr);
  64         return ops->mapping_error(dev, dev_addr);
  65 }
  66
  67 static inline int dma_supported(struct device *dev, u64 mask)
  68 {
  69         struct dma_map_ops *ops = get_dma_ops(dev);
  70         return ops->dma_supported(dev, mask);
  71 }
  72
  73 static inline int dma_set_mask(struct device *dev, u64 mask)
  74 {
  75         if (!dev->dma_mask || !dma_supported(dev, mask))
  76                 return -EIO;
  77         *dev->dma_mask = mask;
  78
  79         return 0;
  80 }
  81
  82 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
  83 {
  84         if (!dev->dma_mask)
  85                 return 0;
  86
  87         return addr + size - 1 <= *dev->dma_mask;
  88 }
  89
  90 static inline void dma_mark_clean(void *addr, size_t size)
  91 {
  92 }
  93
  94 #define dma_alloc_coherent(d, s, h, f)  dma_alloc_attrs(d, s, h, f, NULL)
  95 #define dma_free_coherent(d, s, h, f)   dma_free_attrs(d, s, h, f, NULL)
  96
  97 static inline void *dma_alloc_attrs(struct device *dev, size_t size,
  98                                     dma_addr_t *dma_handle, gfp_t flags,
  99                                     struct dma_attrs *attrs)
 100 {
 101         struct dma_map_ops *ops = get_dma_ops(dev);
 102         void *vaddr;
 103
 104         if (dma_alloc_from_coherent(dev, size, dma_handle, &vaddr))
 105                 return vaddr;
 106
 107         vaddr = ops->alloc(dev, size, dma_handle, flags, attrs);
 108         debug_dma_alloc_coherent(dev, size, *dma_handle, vaddr);
 109         return vaddr;
 110 }
 111
 112 static inline void dma_free_attrs(struct device *dev, size_t size,
 113                                   void *vaddr, dma_addr_t dev_addr,
 114                                   struct dma_attrs *attrs)
 115 {
 116         struct dma_map_ops *ops = get_dma_ops(dev);
 117
 118         if (dma_release_from_coherent(dev, get_order(size), vaddr))
 119                 return;
 120
 121         debug_dma_free_coherent(dev, size, vaddr, dev_addr);
 122         ops->free(dev, size, vaddr, dev_addr, attrs);
 123 }
 124
 125 /*
 126  * There is no dma_cache_sync() implementation, so just return NULL here.
 127  */
 128 static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
 129                                           dma_addr_t *handle, gfp_t flags)
 130 {
 131         return NULL;
 132 }
 133
 134 static inline void dma_free_noncoherent(struct device *dev, size_t size,
 135                                         void *cpu_addr, dma_addr_t handle)
 136 {
 137 }
 138
 139 #endif  /* __KERNEL__ */
 140 #endif  /* __ASM_DMA_MAPPING_H */